Abstract
Laboratory studies indicated that only 2 insecticides, endrin and Dursban® (O,O -diethyl 0-3,5,6-trichloro-2-pyridyl phosphorothioate), of 18 tested as direct-contact poisons against 3rd- to 4th-instar larvae of the black cutworm, Agrotis ipsilon (Hufnagel), were more effective than aldrin. Seven other materials were only slightly less effective than aldrin, while the remainder were considerably less effective. The larval instars showed a marked difference in tolerance to aldrin and Dursban and became increasingly tolerant with each successive instar. Tests with technical formulations applied to the surface of a moist sandy loam indicated that Dursban, Bayer 37289 (O -ethyl O -2,4,5-trichlorophenyl ethylphosphonothioate), and parathion showed promise as soil treatments. Subsequent tests indicated that soil moisture, soil type, method of application, and formulation were all factors influencing the toxicity of insecticide-soil treatments.
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